217629668 has 12 divisors (see below), whose sum is σ = 386536752. Its totient is φ = 107190600.

The previous prime is 217629637. The next prime is 217629673. The reversal of 217629668 is 866926712.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 405758 + ... + 406293.

It is an arithmetic number, because the mean of its divisors is an integer number (32211396).

Almost surely, 2^217629668 is an apocalyptic number.

It is an amenable number.

217629668 is a deficient number, since it is larger than the sum of its proper divisors (168907084).

217629668 is a wasteful number, since it uses less digits than its factorization.

217629668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812122 (or 812120 counting only the distinct ones).

The product of its digits is 435456, while the sum is 47.

The square root of 217629668 is about 14752.2767056478. The cubic root of 217629668 is about 601.5051727859.

The spelling of 217629668 in words is "two hundred seventeen million, six hundred twenty-nine thousand, six hundred sixty-eight".